from django.dispatch import Signal

username_block = Signal()  # (providing_args=["username"])
username_unblock = Signal()  # (providing_args=["username"])
ip_block = Signal()  # (providing_args=["ip_address"])
ip_unblock = Signal()  # (providing_args=["ip_address"])


class BlockSignal:
    """
    Providing a sender is mandatory when sending signals, hence
    this empty sender class.
    """

    pass


def send_username_block_signal(username):
    username_block.send(sender=BlockSignal, username=username)


def send_username_unblock_signal(username):
    username_unblock.send(sender=BlockSignal, username=username)


def send_ip_block_signal(ip_address):
    ip_block.send(sender=BlockSignal, ip_address=ip_address)


def send_ip_unblock_signal(ip_address):
    ip_unblock.send(sender=BlockSignal, ip_address=ip_address)